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I. General Introduction

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I. General Introduction SECTION 3 ACIDITHIOBACILLUS I. General Introduction This document presents information that is accepted in the literature about the known characteristics of bacteria in the genus Acidithiobacillus. Regulatory officials may find the technical information useful in evaluating properties of micro-organisms that have been derived for various environmental applications. Consequently, this document provides a wide range of information without prescribing when the information would or would not be relevant to a specific risk assessment. The document represents a snapshot of current information (end-2002) that may be potentially relevant to such assessments. In considering information that should be presented on this taxonomic grouping, the Task Group on Micro-organisms has discussed the list of topics presented in the “Blue Book” (i.e. Recombinant DNA Safety Considerations (OECD, 1986)) and attempted to pare down that list to eliminate duplications as well as those topics whose meaning is unclear, and to rearrange the presentation of the topics covered to be more easily understood (the Task Group met in Vienna, 15-16 June, 2000). This document is a first draft of a proposed Consensus Document for environmental applications involving organisms from the genus Acidithiobacillus. II. General Considerations 1. Subject of Document: Species Included and Taxonomic Considerations The four species of Acidithiobacillus covered in this document were formerly placed in the genus Thiobacillus Beijerinck. In recent years several members of Thiobacillus were transferred to other genera while the remainder became part of three newly created genera, Acidithiobacillus, Halothiobacillus, Thermithiobacillus, and to the revised genus Thiobacillus sensu stricto (Kelly and Harrison, 1989; Kelly and Wood, 2000). The reassignment to these three newly designated genera was based on physiological characteristics and 16S rRNA gene sequence comparisons (Kelly and Wood, 2000). Acidithiobacillus contains two species (A. ferrooxidans and A. thiooxidans) of the original genus Thiobacillus that have the potential to cause significant ecological damage. Two other species have been reassigned to this new genus, A. caldus and A. albertensis. All these species have been, or are likely to be, employed in various biotechnological applications in the environment. 2. Characteristics of the Organism: Identification and the Methods Used to Identify the Organism A. Characterisation of the genus Acidithiobacillus The genus was established by Kelly and Wood (2000), with A. thiooxidans (formerly Thiobacillus thiooxidans) as the type species. The four species included in the genus are Gram-negative, rod-shaped (0.4 x 2.0 µm), motile with one or two flagella, and possess the ability to use reduced sulphur compounds as electron donor for autotrophic growth, in common with various other unrelated “sulphur bacteria” (Kelly and Harrison, 1989; Kuenen et al., 1992). As with other Thiobacillus species now redistributed, members of this genus are distinguished morphologically from other colourless sulphur bacteria by 394 Section 3 - Acidithiobacillus forming external rather than internal sulphur particles (Kuenen, 1989). They are strictly aerobic and obligately acidophilic (optimum pH < 4.0). Some species oxidise ferrous iron and hydrogen (Table 4.12) or use natural and synthetic metal sulphides to generate energy, while one species (A. ferrooxidans) can oxidise iron. The optimum temperature ranges from 30-35 OC for mesophilic species to 45 OC for moderately thermophilic species. All of the species contain ubiquinone Q-8, and the G+C content of the DNA is 52-64 mol %. Thiobacillus sensu stricto now contains only species belonging to the β-subclass of the Proteobacteria, but Acidithiobacillus, together with Halothiobacillus and Thermithiobacillus, have been assigned to the γ-subclass (Kelly and Wood, 2000). A full account of the genus is given in the section contributed by Kelly and Wood (2005) in the 2nd edition of Bergey’s Manual of Systematic Bacteriology. B. Differentiation of Acidithiobacillus from related taxa Members of the genus are distinguished by their obligate acidophilic nature (pH < 4.0) and possession of ubiquinone Q-8. C. Characters used in classification Phenotypic characters Many of the phenotypic characters of Acidithiobacillus such as the rod-like shape, motility, Gram- negative reaction and utilisation of sulphur compounds are shared in common with species formerly placed in Thiobacillus. These characters are useful for broad recognition but no longer for critical identification. Mol% G+C content The determination of the mol % G+C content of the DNA of bacterial isolates has been used for a long time to determine whether strains could be related to each other. It is to some extent, a negative test. While widely differing G+C values can suggest that two isolates are not related, matching G+C values do not guarantee that they are the same. G+C values for the four species of Acidithiobacillus are, however, often sufficiently far apart to serve as useful species characteristics. Ubiquinones and cellular fatty acid analysis Lane et al. (1985) determined that there was a correlation between ubiquinone type and physiological behaviour. Katayama-Fujimura et al. (1982) used types of ubiquinones and the DNA base composition to differentiate 11 species of the former genus Thiobacillus. The association between species and ubiquinone type was constant except for T. perometabolis, one strain having 8 and the other 10-isoprene units. Species presently assigned to Acidithiobacillus all possessed eight units. The strain of A. ferrooxidans examined by the later authors was unique in that it had ubiquinones with 9 as well as 8 isoprene units. Nucleotide structure 5S rRNA sequences were obtained for thirteen species of the original genus Thiobacillus (Lane et al., 1985, 1992) and these sequences were shown to be distinct for each species. Similarities within the sequences also enabled the species also to be assigned to the α, β or γ groups of the four groups of Proteobacteria, the last group including species of Acidithiobacillus. DNA homologies DNA hybridisation studies on A. ferrooxidans and A. thiooxidans, together with Thiobacillus thioparus and five bacteria formerly placed in Thiobacillus (Huber and Stetter, 1989, 1990) established the value of these tests because they showed that there was usually a high degree of homology (>70%) between strains of the same species. 395 Part 4 – Consensus Documents on Micro-Organism Table 4.12 Acidithiobacillus : Characters used in classification Species Optimum pHa pH range Optimum Temperature Ubiquinone Mol % Subclass of References temperature range G+C Proteobacteria Strictly chemolithotrophic and autotrophic Acidithiobacillus albertensis 3.5-4.0 2.0-4.5 28-30 ND Q-8 61-62 ND b, c Acidithiobacillus 2.0-2.5 1.3-4.5 30-35 2-37 Q-8 58-59 γ b, d, e ferrooxidans Acidithiobacillus 2.0-3.0 0.5-5.5 28-30 10-37 Q-8 52 γ b, f thiooxidans Facultatively chemolithotrophic or mixotrophic with tetrathionate Acidithiobacillus caldus1 2-2.5 1-3.5 45 32-52 Q-8 63-64 γ g ND: not determined 1Moderately thermophilic aKatayama-Fujimura et al. (1982); bKelly and Harrison (1989)); cBryant et al. (1983); dLeduc and Ferroni (1994); eMcCready (1988); fFliermans and Brock (1972); gHallberg and Lindstrom (1994). 396 Section 3 - Acidithiobacillus D. Comments on the species Acidithiobacillus albertensis Syn. Thiobacillus albertensis (Bryant et al., 1983; Kelly and Harrison, 1989; Kelly and Wood, 2000). This species is distinguished morphologically by a tuft of polar flagella and a glycocalyx extending outwards from the outer membrane of the bacterial cell envelope and which is used to attach itself to elemental sulphur (Bryant et al., 1983). These features together with the relatively high G+C content of the DNA, differentiate this species from the other three (Kelly and Wood, 2000). It has been tentatively assigned to Acidithiobacillus because a 16S rRNA sequence for the species is not yet available (Kelly and Wood, 2005). Acidithiobacillus caldus Syn. Thiobacillus caldus (Hallberg and Lindstrom, 1994; Kelly and Harrison, 1989; Kelly and Wood, 2000). This species is distinguished by extremely short rod-shaped cells, each with a single polar flagellum (Hallberg and Lindstrom, 1994), and by its moderately thermophilic nature. It cannot oxidise sulphidic ores, but it may be found associated with others involved in leaching. It is facultatively rather than obligately chemolithotrophic. A specific, fast and sensitive non-radioactive immuno-binding assay had been used for the detection and enumeration of this species (Amaro et al., 1994). Chemiluminescence or peroxidase-conjugated immunoglobulins are employed in a dot or slot blotting system. This method is very convenient for monitoring bioleaching micro-organisms in effluents from industrial bioleaching processes. Acidithiobacillus ferrooxidans Syn. Thiobacillus ferrooxidans (Temple and Colmer, 1951; Kelly and Harrison, 1989; Kelly and Wood, 2000). Morphologically this species appears to be distinguished by a single coiled flagellum in mature cells (Gonzalez and Cotoras, 1987). Also, this is the only species in the genus so far to be able to utilise iron as well as sulphur. Serological and electrophoretic methods have been employed for the rapid detection of isolates of A. ferrooxidans and the differentiation of strains (Jerez et al., 1986). Different serotypes, characterised by specific lipopolysaccharide banding patterns
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